12V 2A SMPS Wall Adapter (barrel)
by Generic / ISI-ish
SKU: PSA-CMP-ADAPTER-12V
No reviews yetTypical India street price
₹150–₹350
Power motors, solenoids, LED strips without begging USB.
Interface: 5.5×2.1 mm barrel
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Concept
Mains SMPS to a safe-ish 12 V DC barrel.
A little theory
Centre-positive is the Arduino convention. Check polarity with DMM. In the classroom, treat 12V 2A SMPS Wall Adapter (barrel) as a beginner part using 5.5×2.1 mm barrel. Typical India street price is about ₹150–₹350. Always verify voltage and pin labels on your exact module — silk screens vary across clones. Start with a datasheet or trusted learn guide, power the part correctly, share GND with the MCU, and test with a simple blink/read sketch before building the full project. Measure voltages with a multimeter when something fails, and keep actuator current off the MCU regulator.
How it works in a project
Barrel to jack or screw terminal; common GND with MCU.
Classroom & project use
- Robot bench supply
- LED strips
- Solenoid
Buying in India
Precautions
- Centre polarity
- Don’t share with people as a USB charger
Specifications
| Out | 12V 2A |
| Plug | 5.5x2.1mm |
| Category | Power Supply |
| Difficulty | Beginner |
| Voltage | 12V DC |
| Interface | 5.5×2.1 mm barrel |
Pinout
See module silkscreen: typically VCC, GND, and signal pins. Confirm labels against the seller photo — clones vary.
